CPU PROBLEMS

i HAVE A aOPEN MOTHERBOARD ( AX6BC-VER2 )CURRENTLY RUNNING A CELERON 733CPU. I’VE BOUGHT A CELERON 1.3GHz CPU WITH THE SAME 370 SOCKET (FC-PGA2) IT FITS BUT THE COPUTER WILL NOT BOOTUP.
WHAT CANT I DO? BIOS, JUMPERS, WHAT DO I CHANGE?
ANY HELP WOULD BE GREAT!!
THANKYOU.